Fused preparation for glass batches



" paktentecijan.

The invention relates tothe art ofilsjs-'jinanj-M suiphtefandf-Zsodiunr"chloride"-(or *other metalll l ufacture,` and' more ipsllrti'cularly preparati halide) in'ayfyary from oneefo'urth l'of `a molecular wl'iichlwhen added 4`to aniordina; yglas'sbatcli-pr weiighthtoabouttwo:molecular weights ofwbariumr- An object of th'linventinfis tdiprovid fa'fnew metialfhal-idei which corresponds -to fromabout 58d 5"* i `A `further object is to combinepa bariumfcomj* pairtsbyweighttof barium sulphate'iand Y'1 partby poundhwitn another substance'or substances -in1a weightofi-sodium i chloride-hasv beenjfound to be separate-#fusionytheresultinfrnas 'hviiigethrveryecients properties,-whemdissolved glis` ummm-ng f In 'making-the preparation, i the-barium sur` t `prima p gowwithl aglassbatcnzanemnicn 1 aus and ais'siiesw fromsoogffcsto abone-150m c;y (1472" B15-273,291l F;

glass and increasing the brilliance of theiinished* vidd-iandfthoroughl-y -inixedfend-ideliireredyto `a `glass.-U Y i "'1 hotcrucblein smalliquantities;Apreferablyfaddi- A` ffurtherM-obiect-i isftoffprbvid 1 Viil l` Jtigir-raliquantitiesi beingl added tothe-"fused mass which. -maylbev-mixed 1in anyV` idesiiie 30m` Theadditionarof- .barium tsulphateiiinbq/afryinglswen,@Qimmy pulvezedmand mixed .wth-Manylrgom:

,quantities to -afglassibathf-orprodcineiwariuswstandard typiofi'elasslbatcn and-melted'f-fin time effects has long been known, and While theseectszrfgmgsgf fu'rimce tu@ I prpam-,om melts; @admise ofi-barium produced',imtheemeltihgiofsthe-.glass `S011, ireadiyytiwmheteibatch; much m01@.readilyA and `inpthe'iinisheduglassarticles:have been' cbmrffqthn when ai quantity'ofwbarumfsulphatecorre-Wl i fxrnonaknowledge for manso yearsgeyeti thetsolutionfflspon' 0f bariumSulphateudilclilyfma molbenimassuofmfusioi u ,addduithep @o the. batch opi-,Ot the t glass has i been iaccompamedtwlth 1prfguflfb'alfinfile@motten @glas'grariofwithout1deve1oping-objectionp l culteswhich` havefdiscouragedutsfnmorefgeneraliaabefmresfloften;experienced when ibis tip 45H preferably,anialkailimetalihalidewspecicallyiso-1rproperty of funotiomngshe-mey diretly-.ornindeefil diumcchlorid'e; in.;suitableipi:opo1stionsThe sube: djfegtlyyva-Sggidolrizem; mmm-,1. anymfe'rmus stances:` are ziflrstf finelyirdividedgethen :mixedeiandiironziswomertd .t thei .ifefrCr-.lstai-,efalsa.; fused.-ito.a.quietl.usionguand the resulting mass someioiiithe irondsivolaigedifromwth@molten@Y suitably subdivided into particles which may vars" glass as chloride fume, resulting in a clearer and 50 in size from one-fourth inch mesh to aA fine more colorless glass than couldhave been ob- 50 f powder; a fifty mesh size has been found to be tained from the same batch without the addition e'cient. The subdivided mass is thoroughly of the preparation. This property of also funcmixed with any standard formula of glass batch, tioning as a decolorizer permits the use of a reand the mixed mass delivered toa glass furnacein duced quantity of selenium, manganese, or other U55 the usual manner. The proportions of `barium decolorzer to accomplish the same degree of de- 55 ding fito `tllet-A originally" employed inS-thew-B" colorization, thereby contributing to a greater f melted, and dissolves freely in the molten glass,`

product; the sodium chloride maybe crude rockV salt. It has been found that some of the. ironv occurring as an impurity in these products is eliminated by volatilization during the fusion. Anyremaining iron is converted to the ferric condition and is decolorized in the glass furnace,

Any remaining impurities in the raw materials have not'been found to be objectionable. During A- the fusion, an interchange of acid radicles is believed to take place, with the result that when barium sulphate and sodium chloride are used, the final preparation is believed to contain barium chloride, sodium chloride, sodium sulglass, etc., and it may also be used with advantage in colored glasses, such as amber glass, blue glass, etc.; such colored glasses have a greatly increased brilliance resulting from the use of the preparation.

What I claim is:

1. A preparation for a glass batch, comprising the product resulting from a fusion of a mass consisting of barium sulphate'and a metal halide.

l A2. vLA, preparation to be added to a glass batch,

'- comprising the product resulting from the fusion 4of a mass consisting of barium sulphate and an alkali ymetal halide.

3. A preparation tube-added to a glass batch,

- comprising the product resulting from the fusion phate, and some barium sulphate. But What#k u ever its composition, the preparation-is easily batch, the barium in the preparation performing the same beneficial functions as barium sulphate When the latter is added in the usual manner, butwithout causing any objectionable dis? turbances sometimes encountered in the old practice. The sodiumsulphate present acts like salt cake, rising to the top of the molten glass and therebyA reducing its effecten the decolorizer.

As noted above, other metal halides may be used in the place of sodium chloride. The halides of the alkali and alkaline earth metals of the Periodic groups l and 2 may be used instead of chlorine, but for-,reasons of economy in production, sodium chloride is preferred. The chlorine, free or combined, functions as a decolorizer and an oxidizer in the molten glass. In the place ofthe sodiumfchloride, there may be used potassium chlcride, or mixed halides, for example, mixed sodium chloride, and potassium chloride, or the crude mineral Carnallite, or other mixed halides `With or Without sodium chloride; andas additions to the sodium chloride, there may be` ,added sodium fluoride, calcium fluoride, sodium carbonate, sodium acid sulphate, calcium carbonate, crude fluor spar, any ofthe boro-n compounds, Y

. borax, rasoi-ite or colemanite, phosphates, ,soda

ash or salt cake, and similar substances which .have the property ofreducing the temprezraturexl Vnecessary to produce fusions of this kin 'Y dium chloride.

5.v A Apreparation to be` added. toa glass batch, comprising the'product resulting from the fusion of a, mass consisting. ofbarium sulphate and a plurality of yfusible metalfhalides.

A6. A glass batch comprising the `standard. ingredients for making glassintimately mixed with a disintegrated` preparation consisting of a fused product of a bariumcompound and a halogen compound of a metal Whose oxide has an alkaline reaction. y A

7. A glass batch comprising the standard ingredients for making glass intimately mixed with a disintegrated-preparation consisting of a fused product of afbarium compound and a chlorine C0II1P0l1nd.

8. A glass batch comprising the standardmkgredientsfor making glass intimately mixed with .fusing a mass'iconsisting of barium sulphate with a metal halide, adding the product to Va glass batch, and then fusing the mass to make glass.

10. The; method of,V incorporating a barium vcompoundawith glass, which comprises separatevAsconvenient method of disintegrating: thev preparation is to directa blast of air across ay stream of the molten material as it -isbeing .poured out of the Crucible; this blows the molten massr into a stream of fine particles which Will f have a iineness of about i-lfty mesh, the fine par,-

ticles collecting in a suitable receiver. .A prac-V tical quantity of the preparation to be added to the batch, When calculated on a bariumoxide content, is from about one-half per cent by weight toV4 about eight per cent by weight in vbarium oxide,l of the Weight ofthe batch. With some glasses, the barium may replace apart of the calciumV normally present, i

As noted above, the preparation may. -be used.:

with any of the standard types of `glass batch,

for example, window'glass, bottle glass, table Ware ly fusing a mass consisting of barium sulphate With mixedalkali metal halides, adding the prod- Huct toa glass batch, and then fusing the mass to make glass.

`11. The methodof incorporating a barium com- Y'pound. with glass, vwhich comprises separately fusingv a mass consisting of barium sulphate with sodium chloride, nely dividing the resulting mass, mixing the finely divided substance with glass-forming materials totobtain a mixed glass batch, and then melting the mass to form glass.

12. The method of making glass, which comprises Irst preparing a substanceby melting together a mass consisting of barium sulphate and sodium chloride untill ai quiet fusion is obtained, disintegrating the fused mass into a finely divided product, mixingsaidfinely divided product with a glass batch, and melting the mixed product and glass'ibatch in 'a glass-furnace tomake glass.

I., v FRANCIS'C. FLINT. 

